verb
1
BAD : I slept at ten o'clock last night.
GOOD : I went to bed at ten o'clock last night.
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sleep = be asleep: 'Nurse Burnley works all night and sleeps all day.'
go to bed = get into bed at the end of the day: 'After dinner I had a hot bath and then went to bed.'
2
BAD : I started sleeping and didn't wake up till the next morning.
GOOD : I fell asleep and didn't wake up till the next morning.
BAD : After showing the conductor my ticket, I started sleeping again.
GOOD : After showing the conductor my ticket, I went back to sleep.
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go to sleep or fall asleep = enter a state of unconsciousness, especially so that your mind and body can rest: 'As soon as I started to read her a story, she went to sleep.'
go back to sleep or fall asleep again = go to sleep again: 'The alarm clock rang at 7.45 but I just turned over and went back to sleep.'